Abstract:
The mechanism of creation of electron-hole trapping centers in CaSO4 at 15-300 K was investigated by
the methods of vacuum-ultraviolet and thermoactivation spectroscopy. It is shown that electron-hole
trapping centers are formed upon trap of electrons in the anionic complexes SO2−
4
and localization
of holes in the form of SO−4 radical. Based on the measurement of the spectrum of excitation of
long-wavelength recombination emission at 3.0-3.1 eV and 2.7 eV, the energy distance of the formed
electron-hole trapping centers was estimated (4.43 eV and 3.87 eV).
